Fig. 1. Diagram of terminal optical system of SGII-upgraded facility [ 7 ]

Fig. 2. 3 ω laser-parameter precision diagnostic system of SGII-upgraded facility. (a) Diagram; (b) optical path arrangement

Fig. 3. 3 ω far-field focal spot of high power driver similar to NIF. (a) Distribution of intensity; (b) encircled-energy integral diagram

Fig. 4. 1 ω far-field focal spot when flux density of 3 ω laser pulse is 2 J·cm -2 . (a) Distribution of intensity; (b) encircled-energy integral diagram

Fig. 5. Near-field measurement results. (a) Full-diameter near-field data of 3 ω pulse; (b) simulated far-field focal spot of 3 ω pulse at focal plane of terminal optical system; (c) high resolution near-field data in local area

Fig. 6. Interferometer wavefront of local areas of wedged focus lens

Fig. 7. Influences of phase-type periodic structure on 3 ω near-field intensity modulation. (a) Simulated result; (b) actual measurement result

Fig. 8. Temporal waveform